Bearing for steam-feed piston-rods.



1N0. 736,367. PATENTED AUG. 18, 1903.

H. G. DITTBENNER.

BEARING FOR STEAM FEED PISTON RODS.

APPLIOATION FILED DBO. 1a, 1901.

H0 MODEL.

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NITED STATES iatented August 18, 1903 PATE T OFFICE.

HERMANN G. DITTBENNER, OF MINNEAPOLIS; MINNESOTA, ASSIGNOR TO HENRY H. SMITH, OF MINNEAPOLIS, MINNESOTA.

BEARING FOR STEAM-FEED PISTON-RODS.

SPECIFICATION forming part of Letters Patent No. 736,367, datedAug'ust 18, 1903. Application filed December 19. 1901. Serial No. 86,645. (No model- To all whom, it may concern.-

Be it known that I, I-IERMANN-G. DITTBEN- NER, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain Improvements in Bearings for Steam- Feed Piston-Rods, of which the following is a specification.

This invention relates to improvements in steam-feeds for sawmill-carriages, and particularly to improvements in cylinder-heads, through which the piston-rod passes and by which it is ordinarily supported.

My invention consists generally in a bearing-block arranged in the cylinder-head and constructed to form a support for the pistonrod where it passes through the cylinder-head and stuffing-box.

The invention consists, further, in the constructions and combinations hereinafter described, and particularly pointed out in the claims. V

In the accompanying drawings, forming a part of this specification Figure 1 is a longitudinal section on line y y of Fig. 3 of a portion of a steam-feed cylinder for a sawmill-carriage, showing the arrangement of the piston and piston-rod therein. Fig. 2 is a partial side Fig. 3 is a transverse section on line was of Fig. 1.

In the drawings, 1 represents a portion ofa steam-cylinder such as is generally employed I for operating a sawmill-carriage. This cylindermaybe of any usual or preferred construc= tion and be provided with suitable steamports, valves, and operating mechanism.

2 represents the cylinder-head, which, ex-.

cept as hereinafter specified, may be of the usual construction and secured in position by bolts 3 or other suitable means.

5 is the piston arranged within the cylinder and provided with the usual piston-rod 7.

Both the cylinder and the piston-rod when used in connection with a sawmill-carriage are of considerable length-that is to say, each is of a length substantially equal to the greatest travel of. the carriage, the movement of the carriage being obtained by the reciproeating movement of the piston in the cylinder. Ordinarily the cylinder-head is provided with a long stuffing-box through which the piston- I rod passes.

There is of course considerable downward pressure exerted upon the stuffungbox'from this long piston-rod, and this occasions considerable wear both in the stuffingbox and on the under side of the piston-rod. Moreover, with this construction it is diflicult to keep the bearings sufficiently lubricated, and the rod soon cuts out, and is thereby seriously impaired. I remedy these defects by providing in the cylinder head a separate bearing-block 9, provided with a suitable babbitted upper surface 11, said block being arranged in a recess 13 in the cylinderhead. A cap-plate 15 is secured in position over the opening to the recess which is on the under side of the cylinder-head by means of suitable bolts 17. An adjustable screw 19 passes through the cap 15 and engages the under side of the block 9. A short stufting-box 21 is arranged at the outer end of the cylinder-head.

preferred construction. By means of this construction the block 9 may be properly adjusted so as to form a support for the piston-rod and prevent the downward pressure of said rod upon the stuffing-box and the consequent wear upon the stufling-box. The block may be adjusted as often as is necessary or it can be readily removed and a new' block substituted therefor. Moreover, the recess in which the block is placed being in direct communication with the cylinder, the bearing-block and the rod are always sufficiently lubricated by the cylinder-oil. With this construction there is practically no downward pressure on the stuffing-box, and consequently very little wear on said stuffing box. While I have shown the bearing-block placed within a recess formed in the cylinder-head, its location, so long, as it is between the piston and the stuffing-box, is not material, and it would be an equivalent construction to place the bearing-block directly within the cylinder. I prefer, however, to place it in the recess in the cylinder-head, as thereby it is more readily accessible and does not interfere with the full travel of the piston. WVhile Ihave described the bearing-block as arranged in connection with the steam-feed cylinder of a sawmillcarriage, it will be understood that I do not confine myself to its use in this connection, as the invention may be used in connection with any other steam-cylinder.

I claim as my invention 1. A steam-feed cylinder-head provided with a suitable stuffing-box and a recess having an open under side between said box and cylinder,a bearing-block provided within said recess and engaging the under side of the piston-rod, space being provided between the walls of said recess and said block to allow movement of the latter to accommodate itself to the swaying or buckling of said piston-rod, means for closing the open under side of said recess and a support for said block engaging it at one point only andpermitting oscillation thereof with said rod.

2. A steam feed cylinderhead provided with a suitable stufiing-box and a recess between said box and the cylinder, a bearingblock for the piston-rod provided within said recess, space being provided between the walls of said recess and said block to allow movement of the latter, a cap-plate secured to said head closing the open side of said recess, and

a set-screw provided in said cap-plate and engaging said block at one point only and permitting oscillation of the block with said rod.

3. A steam -feed cylinderhead provided with a suitable stuffing-box and having in its under side a recess between said box and the cylinder a bearing-block for the piston-rod of said cylinder provided within said recess, space being provided between the walls of said recess and said block to allow movement of the latter, a cap-plate, bolts securing the same to said head closing the open under side of said recess, and a set-screw provided in said cap-plate and engaging said block centrally without entering the same and permitting oscillation of said block with the pistonrod.

In witness whereof I have hereunto set my hand this 16th day of December, 1901.

HERMANN G. DITTBENNER.

Witnesses:

RICHARD PAUL, M, C. NOONAN. 

